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Zubair Alexander
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POP3 Users Getting User Names Rejected |
| Why do we get an error when some of our users log in to the Exchange Server 2007 using POP3? The error states that the user name was rejected. |
| by Zubair Alexander |
9/17/2008 -- This type of error typically results when users have a long user principal name (UPN) that exceeds the default maximum of 40 characters. Because UPN includes the user's log-on name, the @ symbol, and the domain name, if the MaxCommand Size setting for POP3 exceeds 40 bytes, you're likely to see the following error:
There was a problem logging onto your mail server. Your User Name was rejected.
Account: "Account name",
Server: "Server name",
Protocol: POP3,
Server Response: "-ERR Protocol error. Connection is Closed."
Port: 110, Secure (SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC91
There are a couple of ways to resolve this issue. You can either increase the value of MaxCommandSize as described below, or increase the value of MSExchPopImapCommandSize by using the adsiedit.msc snap-in.
To change the MaxCommandSize value, do the following:
- Start the Exchange Management Shell.
- Type "Get-POPSettings" (without the quotes) to view current settings. Notice that the default value of MaxCommandSize is set to 40.
- To increase the value of MaxCommandSize from the default 40 to, say, 50, type "Set-POPSettings -MaxCommandSize 50" (without the quotes). You can use any value between 40 and 1,024 bytes.
- Restart the POP3 service for the changes to take effect.
To change the MSExchPopImapCommandSize, check out the KB article 945552.
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Zubair Alexander, MCSE, MCT, MCSA and Microsoft MVP is the founder of SeattlePro Enterprises, an IT training and consulting business. His experience covers a wide range of spectrum: trainer, consultant, systems administrator, security architect, network engineer, author, technical editor, college instructor and public speaker. Zubair holds more than 25 technical certifications and Bachelor of Science degrees in Aeronautics & Astronautics Engineering, Mathematics and Computer Information Systems. His Web site, www.techgalaxy.net, is dedicated to technical resources for IT professionals. Zubair may be reached at .
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